Brands like ProOne Offering QC & PD Feature on their Power Supply Products like Wall Chargers , Power banks And Many More . But most of People doesn't know what is PD & QC and how this things works. Today I'll explain about it.
What is QC?
QC stands for Qualcomm Quick Charge. It's a popular fast charging technology developed by Qualcomm for devices that use their Snapdragon processors.
How Quick Charge Works:
Quick Charge overcomes this limitation by allowing the charger and your device to "talk" to each other and negotiate a higher voltage for charging. By increasing the voltage (e.g., to 9V, 12V, or even more, depending on the version and your device's needs), more power (measured in Watts) can be transferred, leading to significantly faster charging times.
Key Aspects of QC:
Voltage Negotiation: This is the core of QC. The charger doesn't just blindly pump out more power. It communicates with the device to determine the optimal voltage the battery can safely handle at that moment.
Intelligent Power Management: QC isn't just about speed; it's also about safety and efficiency. It has built-in mechanisms to monitor the battery's temperature and charge level, adjusting the voltage and current to prevent overheating or overcharging. This helps protect your battery's long-term health.
Compatibility is Crucial: For Quick Charge to work, both your charging adapter/power bank and your phone/tablet need to support the same (or a compatible) version of Quick Charge. If one doesn't, the device will simply charge at the standard USB speed.
Different Versions: Qualcomm has released several iterations of Quick Charge (e.g., QC 1.0, 2.0, 3.0, 4.0, 4+, 5). Each new version generally offers faster charging speeds and improved efficiency. Newer versions also often incorporate support for other fast charging standards like USB Power Delivery (USB PD) for broader compatibility.
Backward Compatibility: Newer QC versions are usually backward compatible. So, a phone with an older QC version might still charge faster with a newer QC charger than a standard one, but it won't reach the maximum speed of the newer charger.
Analogy:
Imagine filling a swimming pool with a garden hose (standard charging). It will take a long time. Quick Charge is like using a much wider hose (higher voltage/power) that can fill the pool much faster. However, this wider hose has sensors that monitor the pool's water level and the hose's pressure to make sure it doesn't overflow or burst (safety and efficiency). Both the hose and the pool need to be designed to handle this higher flow rate (compatibility).
What is PD?
PD stands for USB Power Delivery. It is a versatile and increasingly popular fast charging standard for a wide range of devices, from smartphones and tablets to laptops and even some gaming consoles.
How USB Power Delivery Works:
PD is a more sophisticated charging protocol than standard USB or even some proprietary fast charging methods. Here's how it works:
Higher Power Capability: Unlike basic USB which typically delivers up to 2.5W (or 4.5W for USB 3.0), USB PD can deliver significantly more power, ranging from up to 100W in older specifications (PD 3.0) and up to 240W in the latest PD 3.1 Extended Power Range (EPR) specification. This higher power capability allows it to charge larger devices like laptops.
Dynamic Voltage and Current Negotiation: PD-enabled devices and chargers communicate with each other to determine the optimal voltage and current for the most efficient and fastest charging possible at that moment. Instead of a fixed voltage, the charger can supply various voltage levels (e.g., 5V, 9V, 12V, 15V, 20V, and even higher in EPR) and adjust the current accordingly based on the device's request and battery status.
Bi-Directional Power: One of the key advantages of PD is its ability to handle power flow in both directions. This means a device can not only receive power but also supply power to another device if needed (though this is less commonly implemented for charging).
Universal Standard: PD aims to be a universal charging solution, reducing the need for multiple proprietary chargers. It is closely associated with the USB-C connector, which is designed to handle the higher power and data transfer rates of PD. While PD can technically be implemented over other USB connectors, it is most prevalent and fully utilized with USB-C.
Smart and Safe Charging: PD incorporates safety features to prevent overcharging, overheating, and damage to devices. The intelligent negotiation process ensures that devices receive only the power they can safely handle.
Power Profiles: USB PD defines various power profiles that specify the voltage and current combinations a charger can support. Devices request a profile that matches their charging needs.
Programmable Power Supply (PPS): Some newer implementations of USB PD (specifically within PD 3.0 and 3.1) include PPS. This allows for even finer-grained control over voltage and current, enabling more efficient charging and potentially extending battery lifespan by minimizing heat generation.
Key Benefits of USB Power Delivery:
Faster Charging: Significantly reduces charging times for compatible devices, especially larger ones.
Universal Compatibility (with PD devices): A single PD charger can potentially charge various devices, simplifying your charging setup.
Higher Power for Laptops and More: Enables charging of power-hungry devices like laptops over USB-C.
Intelligent and Efficient: Dynamically adjusts power delivery for optimal charging speed and efficiency.
Safer Charging: Includes safety mechanisms to protect devices from damage.
Future-Proof: As more devices adopt USB-C and PD, it becomes an increasingly relevant and long-lasting charging solution.
In Simple Terms:
Think of PD as a smarter and more powerful way to charge your devices via USB, especially through the USB-C port. Instead of a charger simply pushing power at a fixed rate, PD allows the charger and your device to communicate and agree on the fastest and safest way to deliver the necessary power. This makes charging quicker and more versatile, potentially allowing you to use a single charger for everything from your phone to your laptop.
Important Note: While USB-C is the connector most commonly associated with PD, not all USB-C ports or devices support Power Delivery. You need to check the specifications of both the charger and the device to ensure PD compatibility for fast charging